Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 10: Dynamic characteristics type 74HCT245
GND = 0 V; test circuit see
Symbol
t
PHL
, t
PLH
Parameter
Conditions
Min
Typ
Max
Unit
T
amb
= 25
°C
propagation delay An to Bn or Bn see
to An
V
CC
= 4.5 V
V
CC
= 5.0 V; C
L
= 15 pF
t
PZH
, t
PZL
t
PHZ
, t
PLZ
t
THL
, t
TLH
C
PD
3-state output enable time OE to
An or OE to Bn
3-state output disable time OE to
An or OE to Bn
output transition time
power dissipation capacitance
per transceiver
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
V
I
= GND to V
CC
−
1.5 V
-
-
-
-
-
-
12
10
16
16
5
30
22
-
30
30
12
-
ns
ns
ns
ns
ns
pF
T
amb
=
−40 °C
to +85
°C
t
PHL
, t
PLH
t
PZH
, t
PZL
t
PHZ
, t
PLZ
t
THL
, t
TLH
t
PHL
, t
PLH
t
PZH
, t
PZL
t
PHZ
, t
PLZ
t
THL
, t
TLH
[1]
propagation delay An to Bn or Bn V
CC
= 4.5 V; see
to An
3-state output enable time OE to
An or OE to Bn
3-state output disable time OE to
An or OE to Bn
output transition time
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
28
38
38
15
33
45
45
18
ns
ns
ns
ns
ns
ns
ns
ns
T
amb
=
−40 °C
to +125
°C
propagation delay An to Bn or Bn V
CC
= 4.5 V; see
to An
3-state output enable time OE to
An or OE to Bn
3-state output disable time OE to
An or OE to Bn
output transition time
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs.
9397 750 14502
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
12 of 22
PHILIPS [ NXP SEMICONDUCTORS ]
